Wilwood Left-Mounted Valve and Chrome Tandem Master Kit, 1-1/8-inch Assisted-Brake Bore

Chrome powder coating distinguishes the master in this 1-1/8-inch High Volume Tandem package. The black left-side combination valve provides circuit distribution and adjustable rear pressure, with the joining tubes and mounting hardware included. Disc brake systems and components are the focus of Wilwood Engineering's design and manufacturing work for street-performance, specialized and motorsport applications. Bill Wood founded the Camarillo, California company in 1977. Its master cylinders, calipers, fittings, valves, brake lines and rotors are chosen according to the needs of the complete brake system.

Technical Details

• Manufacturer part number: 261-13270-P
• Material: Aluminum
• Cylinder bore: 1-1/8"
• Pressure circuits: 2
• Stroke Length: 1.10 in
• Reservoir Type: Integral
• Fluid capacity: 8.0 / 4.8 oz
• Flange-to-end length: 8.15"
• Overall Length: 8.76"
• Mounting centers: 3.22–3.40"
• Finish: Chrome powder coat
• Native pressure ports: 1/2-20 at both circuits; use the correct included outlet adapters and seal washers
• Circuit outlet adapters: Primary: 3/8-24 or 1/2-20 inverted flare; secondary: 3/8-24 or 9/16-18 inverted flare
• Hydraulic relationship: Equal pressure output from the two circuits before external proportioning; 2:1 primary/secondary volume relationship
• Service: Factory rebuild only; do not disassemble the tandem piston assembly
• Kit contents: Master cylinder, left-side combination proportioning valve and bracket, formed stainless connecting tubes and mounting hardware
• Combination-valve functions: Adjustable rear pressure, isolated front/rear circuits, front-line junction and hydraulic brake-light switch

Fitment & Compatibility

The cylinder is intended primarily for vacuum- or hydraulic-assisted brakes. Confirm the 1.10-inch stroke can occur without interference and that the booster connection fully releases the piston; master flange compatibility alone does not establish suitability.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS985 instructions and specifications
• Wilwood FL331 instructions and specifications
• Wilwood FL162 instructions and specifications
• Wilwood DS487 instructions and specifications

For help choosing the correct service or conversion component, contact PMB Performance with the existing brake-system details. Our team has over 20 years of experience working through parts and fitment requirements.